Thank you, sas and Rygle, for your help!
Putting the eqtexsvg.py file into /usr/share/inkscape/extensions/ instead of ~/.inkscape/extensions has indeed solved the problem :)
Thank you, sas and Rygle, for your help!
Putting the eqtexsvg.py file into /usr/share/ inkscape/ extensions/ instead of ~/.inkscape/ extensions has indeed solved the problem :)